Friction shock-absorbing mechanism



" I S. B. HASELTINE FRICTION SHOCK ABSORBING MECHANISM 7 Filed July 21.1923 2 Sneaks-Sheet. l

Wfzzeasea I/werzr fizzy/3345612236 s B. HASELTINE FRICTION SHOCK:ABSORBING macgmms'm Filed July 21 2 Sheeis-Sh'ct 2 Patented July 8,1924.

I UNITED STATES PATENT OFFICE. 1

STACY B. HASELTINE, or omcneo, ILLINOIS, essrenon, BY missus:ASSIGNMENTS,

T0 w. H. MINER, 11m, A CORPQRATION or DELAWARE.

' FRICTION snoo x-nnsoa'nme monument. A

Application filed July 21, 1923. Serial No. 652,901.

To all whom it 'may concern:

Be it known that I, STACY B. HASELTINE, a citizen of the United States,residin -Chicago, in the county of Cook and tate of Illinois, haveinvented a certain new and useful Improvement in FrictionShock-Absorbing Mechanisms, of which the following is a full, clear,concise, and exact description, reference being had to the accompanyingdrawings, forming a partof this specification.

This invention relates to improvements in friction shock absorbingmechanisms.

An object of the invention is to provide a friction shock-absorbingmechanism especiallyadapted for railway draft riggings,

wherein is obtained high capacity by means of relatively few partshaving large areas of co-operating friction surfaces.

A more specific object of the invention is to-provide a mechanism ofthcicharacter indicated, wherein are employed two frictionally'col-operable cages and associated wedge and spring means, the said cagesalso co-operating to retain the spring, means under initial compressionand, to hold the parts in assembled relation. 1

In the drawings forming a part of this specification, Figure 1 is ahorizontal longitudinal sectional view of a portion of a railway draftrigging showing my improvements in connection therewith. Figure .2 is avertical transverse sectional view of the shock absorbing mechanismproper corresponding substantially to the section line 2 of Figure 1.Figure 3 is a detail perspective of one of the wedge elements em ployedin the construction shown in Figure 1. Figure 4, is aside elevationalview of one of the friction cages shown in Figure 1. And Figure 5, is aview, similar to vention.

Referrmg first to the lfl i n illus' trated in Figures 1' to 4,incliisive, 1010 denote the usual draft sills of a'car underframe to theinner faces of-.-whichare secured front stop lugs 11 and rear stop lugs12. A portion of a draw-bar is indicated at13, the same beingoperatively associated with the shock-absorbing mechanism proper byashooded cast yoke 14. The yoke and mechanistic therewithinaresuppo'rted in operative position a detachable saddle plate 15.

p'ro'per, comprises, broadly, 'tw0 friction cages.AA; twospringresistances BB;'

The improved shock absorbing mechanism:

like construction, comprises a follower section proper 16 adapted toco-operate with the correspondingstop lu 11- or 12, and

an elongated approximate y centrally disposed-leg 17 formed integralwith the fol.-

lower section proper. Each leg 17 is formed with a vertically extendingflat friction surrface 18, the latter extending lengthwise of themechanism and the two legs bein so disposed that, when they are assembleas shown in Figure 1, the two friction surfaces 18 will oppose eachother and willalso be in frictional engagement. The lengths of the legs17 are made such that the two friction cages may approach each other adistance corresponding'to the predetermined compression stroke of themechanism. Each leg 17 is further formed, on the outer sidethat is, theside nearestthe adjacent draft sill-with a curved, longi:

tudinally extending pocket 19 adapted to accommodate the correspondingcoil spring resistance B. Each leg 17 is'suitably braced by flanges 20.On the opposite side of each leg 17 to that which accommodates thespring resistance, each friction cage A is provided with an integral,diagonally extending web 21, the inner surface of which 22 forms a wedgeface adapted to co-operate with the corresponding wedge C As clearlyillustrated in Figure 1, the walls 21 are suitably braced and[strengthened by webs 23. On that side of the leg 17 on which thecorresponding spring '13- is accommo dated, each cage A is provided witha transversely extending web 24, which provides a bearing seat for theadjacent end of the correspondin spring B. At the free end of each leg11 and on the outer side thereof, a friction surface 2-5 is provided,the latter preferably being inclined at a very acute angle with respectto the center line of the mechanism so as to make the en leg 17 slightlytapered. Approximately at their central portions, the legs 17 are pro-VldQd Wlth elongated openings 26, and, at the inner ends of saidopenings, witha lug d of .each,

27 projecting from that side of .the leg opposite to the side which isformed with the spring pocket. As clearly shown in Figure lgthelug 271of one member A is slidably accommodated in the recess 26 of the othermember A and the two shoulders 27 abut when the parts are in their fullnormal release position. In this manner, it will be observed that thetwo friction cages A--A are not only adapted to retain the parts inassembled condition, as shown, but may also be'utilized to maintain thesprings B under initial'compression.

The two wedges C are of like construction, each being preferably in theform of a solid block having an outer wedge face 28; an

inner longitudinally extending friction surface 29; and a transverseflat spring bearing surface 30. Each wedge face 28 co-operates with thecorresponding wedge face 22 of a cage A. and each friction surface 29cooperates with the corresponding tapered ure 1, it being understoodthat the springsfriction surface 25 of the leg of the opposite cage A.

The parts are assembled as shown in Figl wedging action is set upbetween each cage A, corresponding shoes C. and leg 17 of the otherfriction cage The two friction surfaces 18 of the two cages are thuspressed into tight frictional engagement with eachother, and, as thefront friction cage moves rearwardly toward the other cage A, frictionwill be generated throughout the entire length of the-two surfaces18-18. Due to the slight taper or inclination of the friction surfaces25 on the outer sides of and at the .4

ends of the -1egs\17, a slight differential action of the wedges willalso be induced which is accommodated by the wedge C moving slightl,,laterally outwardly. It will also be observetl that friction will begenerated'between each wedge C and friction surface 25 of the leg of thecage at the opposite end of the mechanism. 1,

From the preceding description, 1t will be seen that I employ only fourpieces additional to the springs; that the two wedges may be made fromthe same pattern; that the two friction cages may be made from the samepattern; that a largefrictional wearing area is presented; and that theparts are held in assembled position by the two cages without theaddition of other means.

'Referring next to the construction' illustrated in Figure -5, theconstruction of the 3 two friction cages A--A is approximately the sameas that of the two cages A herein- 7 before described. A difference isfound.

however. in each cage A in that the wedge the two cages A.

inner friction surface 129 which co-operates with the correspondingfriction surface 229 on the leg 117 of the friction cage A. In-

stead of a single wedge beingemployed at each end of the mechanism, Iemploy two wedges, the wedge C just described and a second wedge C Thelatter has a wedge face 128 co-operable with the wedge face 122 and thetwo wedges C. and C have cooperating wedge faces 41 and 42. In theparticular construction of wedges shown, it will be noted that the wedgefaces 122 and 128 extend at a relatively blunt angle with respect to theaxis of the mechanism, whereas the other set of co-operable wedge faces.41 and 12 extend at a relatively keen angle with respect to the axis ofthe mechanism. In this manner, I am enabled to obtain high frictionalcapacity induced by the keen wedge angles 41 and 42 and certainty ofrelease on account of the bluntness of the angles of the faces 122 and128.

Furthermore, in the construction illustrated in Figure 5, I preferablyemploy an interposed, steel, friction plate D between the opposedlongitudinally extending friction surfaces 118118 of the two legs of thecages A. Said plate D has a centrally disposed longitudinally extendingrecess 43 1 in which are accommodated the two lugs 127127 of the twocageS' so as to adapt the plate D for sliding movement with respecttoboth cages A. From the arrangement shown in Figure 5, it will be notedthat the plate Dis'a'dapted for longitudinal movement with respect toeach cage-A in an amount equal to half of the total relative movementpermitted between the two cages A themselves. With this construction,

should theplate D stick with respect to one of the cages A during thefirst part of a compression stroke of the mechanism, nevertheless,during the last part of the stroke said plate will be so held that itcannot have further movement in unison with that cage with which itstuck during the first part of the stroke- With this arrangement, Ireduce the wear on the two friction surfaces 118 to one-half, therebyprolonging the life of Although I have herein shown and described what Inow consider the preferred manner of carrying out my invention, the

same is merely illustrative and I contemplate, all changes andmodifications that come within the scope of the claims appended hereto.1

I claim: I

1. In a friction shock absorbing mechanism, the combination with twofriction cages having longitudinally arranged and opposedvfrictionsurfaces, said cages having integral engaging shoulders limiting theirseparating movement; of spring and wedge means co-operating with saidcages and arranged to exert pressure'in a direction transverse to theline of relative movement of said cages.

2. In afriction shock absorbing mechanism, the combination with twofriction cages having longitudinally arranged and opposed frictionsurfaces,-said cages having integral engaging shoulderslimit-ingtheirseparating movement; of a'friction plate interposed be tween andco-o'perable-with said friction 'surfaces ;'-and spring and wedgenieansco-oper:

' able with said cages and arranged to exert nism,. the. combinationwith two friction cages each having a, follower section and a.longitudinally extending leg, saidlegs being pressure in a directiontransvers'e'to the line of relative movement therebetween.

3. In a friction shcck absorbing mechaprovided with opposed frictionsurfaces; of

means and the follower section of 30 wedge means interposed between'the' outer side of and near the end of each said leg and the followersection'of the other cage; and spring means I between each said wedgeposed friction :cage.

, 4. In a friction-shock absorbing inechaQ nism, the combination withtwo friction cages each having azfollower section and a' longitudinallyextending leg, each leg having a' friction surface on its inner side anda friction surface on its-outer side near the.

end thereof, the said outerffriction surface being inclined with respectto f-the axis of the mechanism; of wedge means interposed cagesea'chhaving afollowe'r sectionand a between each s'a'id'out er frictionsurface and the follower section of the other cage; and

spring means between each said wedge means and the follower section ofthe opposed friction cage.-

5. In a nism, the combination with two. friction the op-' friction shockabsorbing mecha longitudinally extending leg, said legs being providedwith opposed friction surfaces;-of wedge meansinterposed between theouter side of' and'near theend of each said leg and the follower sectionof the other cage;

spring 'means between each said. wedge.

means and the follower section of the opposed friction cage; andco-operable means on said cages arranged to limit the separatingmovement thereof, I

6. In a friction shock absorbing mechanism, the combination with twofriction cages each having afollower sectionand a longitudinallyextending --leg, said legs havfv ing opposed friction surfaces; of afriction plate interposed between saidifr'iction surfaces of the-legsand co-op'erable therewith; 1

wedge means interposed between the outer side of and-near the end of.each said le and the follower section of the other cage;

and spring means between each said wedge.

means and the follower posite friction cage;

nism, the combination with two friction cages each having-a followersection and a 1 longitudinally extending leg, saidflegs hav ing opposedfriction surfaces; of a friction plate interposed between said frictionsur- -section of the op- I v 7. In a'friction shock absorbing mecha-'facesof the legs and co-operable therewith;

wedge means interposed between the outer side of and near the end ofeach said leg and the follower section of the other cage; spring thefollower section of the opposite friction cage; and'co-operable lugs onthe cages ar ranged .to limit the separating movement thereof, and, inconjunction with the springs,

to hold the mechanism in normal assembled relation.

.ineans between each said wedge means and

